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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Tunable Wavelength Soft Photoionization of Ionic Liquid Vapors
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Tunable Wavelength Soft Photoionization of Ionic Liquid Vapors

机译：离子液体蒸气的可调波长软光电离

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摘要

Combined data of photoelectron spectra and photoionization efficiency curves in the near threshold ionization region of isolated ion pairs from [emim][Tf_2N], [emim][Pf_2N], and [dmpim][Tf_2N] ionic liquid vapors reveal small shifts in the ionization energies of ion-pair systems due to cation and anion substitutions. Shifts toward higher binding energy following anion substitution are attributed to increased electronegativity of the anion itself, whereas shifts toward lower binding energies following cation substitution are attributed to an increase in the cation-anion distance that causes a lower Coulombic binding potential. The predominant ionization mechanism in the near threshold photon energy region is identified as dissociative ionization, involving the dissociation of the ion pair and the production of intact cations as the positively charged products.
机译：来自[emim] [Tf_2N]，[emim] [Pf_2N]和[dmpim] [Tf_2N]离子液体蒸气的孤立离子对的接近阈值电离区域的光电子能谱和光电离效率曲线的组合数据显示出电离中的小位移由于阳离子和阴离子的取代，离子对系统的能量。阴离子取代后朝向更高结合能的转变归因于阴离子本身的电负性增加，而阳离子取代之后朝向更低结合能的转变归因于引起更低库仑结合势的阳离子-阴离子距离的增加。在接近阈值光子能量区域中的主要电离机理被确定为解离电离，涉及离子对的解离和完整阳离子作为带正电荷的产物的产生。

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